wip: upgrade hooks

packages/hooks/src/usesuspense.rs

@@ -0,0 +1,44 @@
+use std::{cell::Cell, future::Future, rc::Rc};
+
+use dioxus_core::{Element, ScopeState, TaskId};
+
+pub fn use_suspense<R: 'static, F: Future<Output = R> + 'static>(
+    cx: &ScopeState,
+    create_future: impl FnOnce() -> F,
+    render: impl FnOnce(&R) -> Element,
+) -> Element {
+    cx.use_hook(
+        |_| {
+            let fut = create_future();
+
+            let wip_value: Rc<Cell<Option<R>>> = Default::default();
+
+            let wip = wip_value.clone();
+            let new_fut = async move {
+                let val = fut.await;
+                wip.set(Some(val));
+            };
+
+            let task = cx.push_future(new_fut);
+            SuspenseInner {
+                task,
+                value: None,
+                wip_value,
+            }
+        },
+        |sus| {
+            if let Some(value) = sus.value.as_ref() {
+                render(&value)
+            } else {
+                // generate a placeholder node if the future isnt ready
+                None
+            }
+        },
+    )
+}
+
+struct SuspenseInner<R> {
+    task: TaskId,
+    wip_value: Rc<Cell<Option<R>>>,
+    value: Option<R>,
+}